I have been doing a bit of reading about the new(ish) surface tools in ArcGIS Pro that are delivered under the 'Surface toolset', and in particular the ability to define maximum 'neighbourhood distance' and 'adaptive neighbourhoods' to surface processing.
By way of a little background, my employers are in the process of acquiring a regionwide holding of LiDAR data as part of the national mapping agencies national elevation project (https://www.linz.govt.nz/products-services/data/types-linz-data/elevation-data).
The advent of region wide LiDAR coverage will be a huge benefit to all and it is our intention to mine this dataset as fully and in as robust a manner as possible. With LiDAR data, one of the principal issues we have struggled with is how to derive LiDAR DEM based metrics which adequately account for the variable nature in scale of natural terrain. By this I mean that fine scale features such as small incised streams etc. are freely intermixed with larger features such as hills and valleys. The aim here is to produce meaningful information such as slope groupings that can be applied at a paddock scale.
Traditional matrix based approaches tend to use small windows (3x3, 7x7) to say derive slope and this results in slope information far too detailed and noisy to be practically applied at a paddock scale. Making the window size larger to capture large terrain features by contrast, quickly becomes unwieldy and generalises out important local landscape features.
Manifold have very kindly implemented the excellent sieve tool which goes a huge way to mitigating excess detail in a robust way (and is required to clean up the outputs from the ESRI tools).
It seems however, that on the face of it this new approach from ESRI represents an excellent way to address this problem with LiDAR derivatives and I am wondering if others on the forum have also struggled with multi scale landscape issues?
I am still trying to find out more about this tool, but I would be very interested to hear if anyone has any positive or negative thoughts about such an approach as on the face of it, I would love to see similar implemented in Manifold with their usual panache :)
Landsystems Ltd ... Know your land | www.landsystems.co.nz